SSH & PGP Tools

A short command list on how to use PGP or GPG, SSH key generation and how to install APT packages relating to them.

Generate a GPG encryption key:

gpg --keygen

Generate an SSH key:

ssh-keygen

Installing 7zip tools using APT:

sudo apt install p7zip-full

Installing GPG graphical interface/keychain using APT:

sudo apt install seahorse-nautilus

Port Forwarding / SSH Tunneling

SSH: Local Port Forwarding

# Listen on local port 8080 and forward incoming traffic to REMOT_HOST:PORT via SSH_SERVER# Scenario: access a host that's being blocked by a firewall via SSH_SERVER;ssh -L 127.0.0.1:8080:REMOTE_HOST:PORT user@SSH_SERVER

SSH: Dynamic Port Forwarding

# Listen on local port 8080. Incoming traffic to 127.0.0.1:8080 forwards it to final destination via SSH_SERVER# Scenario: proxy your web traffic through SSH tunnel OR access hosts on internal network via a compromised DMZ box;ssh -D 127.0.0.1:8080 user@SSH_SERVER

SSH: Remote Port Forwarding

# Open port 5555 on SSH_SERVER. Incoming traffic to SSH_SERVER:5555 is tunneled to LOCALHOST:3389# Scenario: expose RDP on non-routable network;ssh -R 5555:LOCAL_HOST:3389 user@SSH_SERVERplink -R ATTACKER:ATTACKER_PORT:127.0.01:80 -l root -pw pw ATTACKER_IP

Proxy Tunnel

# Open a local port 127.0.0.1:5555. Incoming traffic to 5555 is proxied to DESTINATION_HOST through PROXY_HOST:3128# Scenario: a remote host has SSH running, but it's only bound to 127.0.0.1, but you want to reach it;proxytunnel -p PROXY_HOST:3128 -d DESTINATION_HOST:22 -a 5555ssh [email protected] -p 5555

HTTP Tunnel: SSH Over HTTP

# Server - open port 80. Redirect all incoming traffic to localhost:80 to localhost:22hts -F localhost:22 80​# Client - open port 8080. Redirect all incoming traffic to localhost:8080 to 192.168.1.15:80htc -F 8080 192.168.1.15:80​# Client - connect to localhost:8080 -> get tunneled to 192.168.1.15:80 -> get redirected to 192.168.1.15:22ssh localhost -p 8080